简介
我知道有alpha混合的东西的例子不胜枚举,但许多人并不真正的混合物,如在我的文章之一,。有人说,作为混合管理的透明胶片,和一些真正复杂的转换和合并。
我一直坚信会有一个简单的。NET解决方案,如5行代码... ...这是它..

Public Sub SetAlphaRGB(ByRef abm As Image)
Dim bitm As New Bitmap(abm)
' I actually got help on this from using visual studio F1
' Initialize the color matrix.

Dim mxItems As Single()() = { _
New Single() {1, 0, 0, 0, 0}, _
New Single() {0, 1, 0, 0, 0}, _
New Single() {0, 0, 1, 0, 0}, _
New Single() {0, 0, 0, 128, 0}, _ Note that sets alpha at 128 50%
New Single() {0, 0, 0, 0, 1}}
Dim colorMatrix As New System.Drawing.Imaging.ColorMatrix(mxItems)
' Create an ImageAttributes object and set its color matrix.

Dim imageAtt As New System.Drawing.Imaging.ImageAttributes()
imageAtt.SetColorMatrix(colorMatrix, _
                        System.Drawing.Imaging.ColorMatrixFlag.Default, _
                        System.Drawing.Imaging.ColorAdjustType.Bitmap)
' look at properties of imageattributes also can set threshold and gamma
so this routine can handle most of your image manipulations
Dim r1 As RectangleF
r1.X = 0
r1.Y = 0
r1.Width = abm.Width
r1.Height = abm.Height
Dim r2 As RectangleF
r2.X = 0
r2.Y = 0
r2.Width = bm.Width
r2.Height = bm.Height 
'
graphics1.Dispose()
graphics1 = Graphics.FromImage(bm)
Dim brush3 As New TextureBrush(bitm, r1, imageAtt)
brush3.WrapMode = Drawing2D.WrapMode.Tile ' if you want to tile else delete

graphics1.CompositingMode = Drawing2D.CompositingMode.SourceOver
graphics1.FillRectangle(brush3, r2) ' I didnt test but fill path should allow
                                    ' overlay in irregular polygon etc.

'draw image could be used, but if you want to tile a fill option is needed
graphics1.DrawImage(bitm, New Rectangle(0, 0, 1700, 1700), 0, 0,_
                    bitm.Width, bitm.Height, GraphicsUnit.Pixel, imageAtt)
brush3.Dispose()
graphics1.Dispose()
MainForm.PictureBox1.Refresh() ' Required by my project
SetGraphics(MainForm.PictureBox1) ' Required by my project

End Sub

我的孙女平铺超过一个DesignLab(C)2007设计的。这是在128阿尔法(50%)。这确实是约5行代码。如果你玩的图像属性,您可以管理以及阈值和γ。
{S0}

回答

评论会员:projectzombie 时间:2011/12/07
我用彩色矩阵的例子,从这个程式码范例和启发你的代码,我内置的alpha混合的在线版本,可以在查看BR}
修改11月4日'11
评论会员:。LatencyXXX 时间:2011/12/07
{C} 这是一个很酷的想法,所以我想我会重写它。虽然GRP,绘图,及BM被冷落,所以我认为它们是本地类。没有确定的Dispose()在这种情况下。 GC应该处理反正没有。

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